SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af54269d4ee086acac33bd5b3f91bce7fb22e9461a0902006d08611ccebfeee' 
  AND token = 'QW8mZvD/hdF/o2sW2bXJDIxtVNXMXZTJmsmtTWGJRcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables